Hi,
1) When we open a webi report it shows us the error "Cannot retrieve the document from the file repository server". When we try it for 3-4 times then it opens fine.
Check input file repository server status. It should in running mode. if your input/output folders are on network or shared location then these should be accessible. Check the space in the server installation drive.
2) When trying to promote a report/dashboard from QA to Prod or Dev to Prod the promotion fails. Since the QA server was not relocated yet the promotion works fine from Dev to QA.
How are you moving reports from QA/Dev to Prod by BIAR file or direct login on both servers in the promotion management. Try with both option and go with first one or two reports. If direct login will fail for Production from dev/QA then its related with firewall issue as might be server moved to different data centre and ports are not opened. In this case try with BIAR file.
Amit